Washing machine

ABSTRACT

A washing machine includes: a cabinet; a tub; a pump for discharging washing water received in the tub to an outside of the tub; and a valve assembly for introducing washing water discharged from the pump. The valve assembly includes: a valve housing; a first chamber defined inside the valve housing and configured to connect to a circulation flow path for sending washing water introduced from the pump to the tub and a drainage flow path for draining washing water introduced through the pump to an outside of the cabinet; a disc valve configured to linearly move in a vertical direction inside the first chamber and move upward by a pressure of washing water discharged from the pump; and a weight part disposed above the disc valve and configured to apply a load to the disc valve.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of an earlier filing date and rightof priority to Korean Patent Application No. 10-2018-0038867, filed onApr. 3, 2018, the contents of which is hereby incorporated by referenceas if fully set forth herein.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to a washing machine, and moreparticularly, to a washing machine including a valve for circulating ordischarging washing water according to the pressure of washing waterdischarged from a pump.

2. Description of the Related Art

Generally, a washing machine is an apparatus that separates contaminantsfrom clothing, bedding, etc. (hereinafter, referred to as “laundry”) byusing chemical decomposition of water and detergent and physical actionsuch as friction between water and laundry.

Such a washing machine includes a tub containing water, a drain pipedischarging the washing water discharged from the tub to the outside,and a circulation pipe circulating the washing water discharged from thetub to the tub.

In order to pump the washing water discharged from the tub to the drainpipe or the circulation pipe, two pumps connected to respective pipesmust be provided, which generates additional expenses corresponding totwo pumps.

In addition, a single pump may be rotated in the forward direction orthe reverse direction to connect the circulation pipe and the drain pipein both directions. In this case, it is advantageous in that the cost isreduced, but there is a problem that backflow may occur due tomalfunction of a pump motor.

SUMMARY OF THE INVENTION

The present invention has been made in view of the above problems, andprovides a washing machine capable of draining or circulating washingwater discharged from a tub by using a single pump.

The present invention further provides a washing machine capable ofdraining or circulating washing water discharged from a tub by using apump operating in one direction.

The present invention further provides a washing machine which drains orcirculates washing water discharged from a pump by using number ofrevolutions of a pump motor operating in a pump in a drainage mode and acirculation mode in a simple structure.

In accordance with an aspect of the present invention, a washing machineincludes: a cabinet forming an outer shape; a tub for forming a spacefor storing washing water inside the cabinet; a pump for discharging thewashing water stored in the tub to the outside of the tub; and a valveassembly for introducing the washing water discharged from the pumpdownward and discharging the washing water upward, wherein the valveassembly includes: a valve housing forming an outer shape and forming aspace through which the washing water flows therein; a first chamberwhich forms a space inside the valve housing, and is connected to acirculation flow path for sending the washing water introduced from thepump to the tub and a drainage flow path for draining the washing waterintroduced through the pump to the outside of the cabinet; a disc valvewhich linearly moves in a vertical direction inside the first chamberand moves upward by a pressure of the washing water discharged from thepump; and a weight part for applying a load to the disc valve, whereinthe disc valve selectively discharges the washing water introduced intothe first chamber to the circulation flow path or the drainage flowpath, depending on a difference between a magnitude of a pressure of thewashing water discharged from the pump and a magnitude of a pressure dueto weight of the weight part, so that the washing water discharged fromthe pump can flow into the circulation flow path or the drainage flowpath depending on the pressure of the washing water and the weight ofthe weight part.

The disc valve connects the first chamber and the drainage flow path,when the pressure of the washing water discharged from the pump exceedsa set pressure, so that the washing water can flow into the drainageflow path or the circulation flow path depending on the arrangement ofthe disc valve.

The disc valve connects the first chamber and the circulation flow path,when the pressure of the washing water discharged from the pump is equalto or lower than a set pressure, so that the washing water can flow intothe drainage flow path or the circulation flow path depending on thearrangement of the disc valve.

When the valve assembly is in a circulation mode in which the washingwater is sent back to the tub, the pump discharges the washing water insuch a manner that the pressure applied to the disc valve by the washingwater discharged to the first chamber is equal to or lower than thepressure applied to the disc valve by the weight of the weight part,thereby using the pressure of the washing water discharged from the pumpaccording to the mode of washing machine.

When the valve assembly is in a drainage mode in which the washing wateris discharged to the outside of the cabinet, the pump discharges thewashing water in such a manner that the pressure applied to the discvalve by the washing water discharged to the first chamber is greaterthan the pressure applied to the disc valve by the weight of the weightpart, thereby using the pressure of the washing water discharged fromthe pump according to the mode of washing machine.

A first channel connecting the first chamber and the circulation flowpath and a second channel connecting the first chamber and the drainageflow path are formed inside the valve housing, so that the washing waterintroduced into the first chamber can be supplied to the circulationflow path or the drainage flow path through the first channel or thesecond channel.

The disc valve includes: a first disc valve which is disposed inside thefirst chamber and opens/closes a channel communication hole formedbetween the first chamber and the first channel; a second disc valvewhich is disposed above the first chamber and opens/closes a chambercommunication hole formed between the first chamber and the secondchannel; and a disc connecting bar connecting the first disc valve andthe second disc valve, so that force acting on each of the first discvalve and the second disc valve can be transmitted fully.

The first disc valve receives pressure upward from the washing waterintroduced into the first channel, wherein the second disc valvereceives pressure in a downward direction from the weight of the weightpart which is disposed in the upper side to connect the first chamberand the circulation flow path, so that the disc valve can move in bothdirections.

The first disc valve includes: a disc plate receiving pressure ofwashing water introduced into the first chamber; and a sealer which isdisposed in an upper side of the disc plate to seal the channelcommunication hole, so that the first disc valve moves upward to closethe channel communication hole.

The second disc valve has a truncated conical shape whose area isreduced downward so as to open and close the chamber communication hole,so that the chamber communication hole can be effectively sealed.

The weight part includes: a first weight part which is disposed abovethe second disc valve and applies a load to the disc valve; and a secondweight part which is connected to an upper end of the disc connectingbar and applies a load to the disc valve, thereby applying a load to thedisc valve in a direction opposite to the flow direction of the washingwater.

The first weight part includes: at least one first weight for applying aload to the disc valve; and a weight housing which is disposed above thesecond disc valve and forms a space for accommodating the first weight,so that the weight part can be formed by utilizing a space above thesecond disc valve.

The second weight part includes: at least one second weight for applyinga load to the disc valve; a weight case forming a space foraccommodating the second weight; and a weight part-connecting portionconnecting the weight case and the disc connecting bar, so that theadditional weight of the weight part can be adjusted.

The washing machine further includes: a disc guider having a guidergroove into which the disc connecting bar is inserted so as to guide anupward and downward movement of the disc valve inside the valve housing,so that the disc valve can move up and down straightly.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the presentinvention will be more apparent from the following detailed descriptionin conjunction with the accompanying drawings, in which:

FIG. 1 is a perspective view of a washing machine according to anembodiment of the present invention;

FIG. 2 is a side cross-sectional view of the washing machine shown inFIG. 1;

FIG. 3 is a cross-sectional view illustrating an internal configurationof a valve assembly according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view illustrating a configuration of a firstvalve housing according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view illustrating a configuration of asecond valve housing according to an embodiment of the presentinvention;

FIG. 6 is a cross-sectional view for explaining a configuration of apump connector according to an embodiment of the present invention;

FIG. 7A is a side view of a first disc valve according to an embodimentof the present invention;

FIG. 7B is a perspective view of the first disc valve of FIG. 7A;

FIG. 8 is a cross-sectional view illustrating a second disc valve and adisc connecting bar according to an embodiment of the present invention;

FIG. 9 is a view for explaining a weight part according to an embodimentof the present invention;

FIG. 10A is a cross-sectional view illustrating a valve assembly when adisc valve is disposed in a first position according to an embodiment ofthe present invention;

FIG. 10B is a cross-sectional view illustrating a valve assembly when adisc valve is disposed in a second position according to an embodimentof the present invention;

FIG. 11A is a view for explaining the flow of washing water in thedisposition of FIG. 10A; and

FIG. 11B is a view for explaining the flow of washing water in thedisposition of FIG. 10B.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Exemplary embodiments of the present invention are described withreference to the accompanying drawings in detail. The same referencenumbers are used throughout the drawings to refer to the same or likeparts. Detailed descriptions of well-known functions and structuresincorporated herein may be omitted to avoid obscuring the subject matterof the present invention.

Hereinafter, a washing machine according to embodiments of the presentinvention will be described with reference to the drawings.

<Configuration of Washing Machine>

FIG. 1 is a perspective view of a washing machine according to anembodiment of the present invention. FIG. 2 is a side cross-sectionalview of the washing machine shown in FIG. 1.

Referring to FIGS. 1 and 2, the washing machine according to anembodiment of the present invention includes a cabinet 10 defining anouter shape. The cabinet 10 has a substantially rectangularparallelepiped shape. The cabinet 10 includes a front surface 12 onwhich an input port 12 h is formed frontward, a side surface 13 coveringleft and right sides, a rear surface 14 which covers the rear side andthrough which a part of a water supply pipe or drain pipe penetrates, atop surface 11 covering the upper side, and a bottom surface 15supporting the washing machine. A control panel 41 disposed in the upperside of the front surface 12 may be disposed.

In the cabinet 10, a tub 31 containing washing water may be disposed.The tub 31 is provided with an opening formed in the front surface sothat the laundry can be input, and the opening is communicated with theinput port 12 h formed in the cabinet 10 by a gasket 43.

A door 20 for opening and closing the input port 12 h can be rotatablycoupled to the cabinet 10. The door 20 may include a door frame 21 whichis open substantially at a central portion and is rotatably coupled tothe front surface 12 and a transparent window 22 provided in the opencentral portion of the door frame 21.

The gasket 43 is implemented to prevent the leakage of the washing watercontained in the tub 31. The front end portion is coupled with the frontsurface 12 of the cabinet 10 and the rear end portion is coupled withthe periphery of the opening of the tub 31. A portion between the frontend portion and the rear end portion is extended in a cylindrical form.The gasket 43 may be made of a flexible or resilient material. Thegasket 43 may be made of natural rubber or synthetic resin.

In the tub 31, a drum 32 in which laundry is accommodated may berotatably provided. The drum 32 accommodates the laundry, and an openingthrough which the laundry is introduced is disposed on the frontsurface, and is rotated around a substantially horizontal rotationcenter line C. However, the above mentioned “horizontal” is not a termused mathematically as a strict sense. That is, when the rotation centerline C is inclined at a certain angle (e.g., 5 degrees or less) withrespect to the horizontal as in the embodiment, it is considered to besubstantially horizontal because it is also close to be horizontal. Aplurality of through holes 32 h may be formed in the drum 32 so thatwashing water in the tub 31 can be introduced into the drum 32.

A driving unit 38 for rotating the drum 32 may be further provided. Adriving shaft 38 a rotated by the driving unit 38 may be coupled withthe drum 32 while passing through the rear portion of the tub 31.

Preferably, the driving unit 38 includes a direct-coupling type motor.The motor may include a stator fixed to the rear of the tub 31, and arotor rotated by magnetic force acting between the stator and the rotor.The driving shaft 38 a may be rotated integrally with the rotor.

The tub 31 may be supported by a damper 16 installed in a base 15. Thevibration of the tub 31 caused by the rotation of the drum 32 isattenuated by the damper 16. Although not shown, depending on anembodiment, a hanger (e.g., a spring) for hanging the tub 31 in thecabinet 10 may be further provided.

At least one water supply hose (not shown) for guiding the washing watersupplied from an external water source such as a faucet to the tub 31,and a water supply unit 33 for interrupting the at least one watersupply hose may be provided.

A dispenser 35 for supplying an additive such as a detergent, a fabricsoftener into the tub 31 or the drum 32 may be provided. In thedispenser 35, the additives may be separately accommodated according totheir types. The dispenser 35 may include a detergent accommodatingportion (not shown) for accommodating the detergent and a softeneraccommodating portion (not shown) for accommodating the fabric softener.

At least one water supply pipe 34 for selectively guiding the washingwater supplied through the water supply unit 33 to each accommodatingportion of the dispenser 35 may be provided. The water supply unit 33may include at least one water supply valve for interrupting each watersupply pipe 34.

The at least one water supply pipe 34 may include a first water supplypipe for supplying washing water to the detergent accommodating portion,and a second water supply pipe for supplying washing water to thesoftener accommodating portion. In this case, the at least one watersupply valve may include a first water supply valve for interrupting thefirst water supply pipe, and a second water supply valve forinterrupting the second water supply pipe.

The gasket 601 may be provided with a direct water nozzle 42 forspraying water into the drum 32, and a direct water supply pipe 39 forguiding the water supplied through the water supply unit 33 to thedirect water nozzle 42. The water supply unit 33 may include a thirdwater supply valve for interrupting the direct water supply pipe 39.

The washing water discharged from the dispenser 35 is supplied to thetub 31 through a water supply bellows 37. A water supply port (notshown) connected to the water supply bellows 37 may be formed in the tub31.

The tub 31 is formed with a drainage port for discharging washing water,and a drainage bellows 17 may be connected to the drainage port. A pump36 for pumping washing water discharged from the tub 31 through thedrainage bellows 17 and a valve assembly 100 selectively sends thewashing water discharged from the pump 36 to a drain pipe 19 or acirculation pipe 18 may be provided.

The pump 36 may serve to pump the washing water discharged from the tub31 through the drainage bellows 17 to the valve assembly. The valveassembly 100 may selectively send the washing water pumped by the pump36 to the drain pipe 19 or the circulation pipe 18. A pair of thecirculation pipe 18 according to the present embodiment may be providedto supply washing water into the tub 31.

The pump 36 may include an impeller (not shown) for pumping washingwater, a pump housing (not shown) for accommodating the impeller, and apump motor (not shown) for rotating the impeller. The pump housing maybe provided with an inflow port (not shown) through which the washingwater is introduced through the drainage bellows 17 and a discharge port(not shown) through which the washing water pumped by the impeller isdischarged to the valve assembly 100. The discharge port may beconnected to a pump connector 150 of the valve assembly 100. The valveassembly 100 according to the present embodiment is disposed in theupper side of the pump 36.

The flow rate (or the pressure of discharged water) of the pump 36 isvariable. To this end, the pump motor constituting the pump 36 may be avariable speed motor capable of controlling the rotation speed. The pumpmotor may be a Brushless Direct Current (BLDC) motor, but is not limitedthereto. A driver for controlling the speed of the motor may be furtherprovided, and the driver may be an inverter driver. The inverter driverconverts AC power to DC power and inputs the DC power to the motor at atarget frequency.

A controller for controlling the pump motor may be further provided. Thecontroller may include a proportional-integral controller (PIcontroller), a proportional-integral-derivative controller (PIDcontroller), and the like. The controller may receive the output valueof the pump motor (e.g., the output current) as an input, and controlthe output value of the driver so that the number of revolutions of thepump motor follows a preset target number of revolutions.

<Valve Assembly>

FIG. 3 is a cross-sectional view illustrating an internal configurationof a valve assembly according to an embodiment of the present invention.FIG. 4 is a cross-sectional view illustrating a configuration of a firstvalve housing according to an embodiment of the present invention. FIG.5 is a cross-sectional view illustrating a configuration of a secondvalve housing according to an embodiment of the present invention. FIG.6 is a cross-sectional view for explaining a configuration of a pumpconnector according to an embodiment of the present invention. FIG. 7are a side view and a perspective view of a first disc valve accordingto an embodiment of the present invention. FIG. 8 is a cross-sectionalview illustrating a second disc valve and a disc connecting baraccording to an embodiment of the present invention. FIG. 9 is a viewfor explaining a weight part according to an embodiment of the presentinvention;

Hereinafter, the valve assembly according to the present embodiment willbe described with reference to FIGS. 3 to 9.

The valve assembly according to the present embodiment selectively sendsthe washing water to the drain pipe 19 or the circulation pipe 18,according to the pressure of the washing water discharged from the pump36. The valve assembly according to the present embodiment may send thewashing water flowing into the valve assembly 100 to the drain pipe 19or the circulation pipe 18 according to the rotation speed RPM of thepump motor rotating in the pump 36.

The valve assembly 100 according to the present embodiment is configuredsuch that the washing water introduced from the pump 36 selectivelycirculates a first channel 124 a, 124 b communicating with a circulatingflow path formed inside the circulation pipe 18, or a second channel 138communicating with a drainage flow path formed inside the drainage pipe19, depending on the disposition of a disc valve 160. Thus, the washingwater introduced into the valve assembly 100 from the pump 36 may bedrained to the outside of the cabinet 10 or circulated back to the tub31, depending on the disposition of a disc valve 160.

The valve assembly 100 according to the present embodiment includes avalve housing 110 defining an outer shape and forming a space throughwhich the washing water flows therein, a first chamber 114 which forms aspace through which the washing water flows inside the valve housing 110and is connected to the circulation flow path and the drainage flowpath, and a disc valve 160 which moves inside the first chamber 114 andselectively sends the washing water in the first chamber 114 to thecirculation flow path or the drain flow path,

Here, the term ‘connected’ in the ‘first chamber connected to thedrainage flow path’ may mean that the drainage flow path and the firstchamber are directly connected without any other connection passage, ormay mean that the drainage flow path and the first chamber are connectedthrough another connection passage as the another connection passage isdisposed between the drainage flow path and the first chamber.Accordingly, referring to FIG. 3, the expression ‘first chamberconnected to the drainage flow path’ may be interpreted as a concept ofincluding a fact that the first chamber 114 is connected to the drainageflow path through the second chamber 122 and the second channel 138.

<Valve Housing>

In the valve housing 110 according to the present embodiment, a firstchamber 114 through which the washing water discharged from the pump 36is introduced, a first channel 124 a, 124 b connecting the first chamber114 and the circulation flow path, and a second channel 138 connectingthe first chamber 114 and the drainage flow path are formed. Inaddition, a second chamber 122 which connects the first chamber 114 andthe second channel 138 and in which a part of the disc valve 160 isdisposed is formed inside the valve housing 110 according to the presentembodiment.

The valve housing 110 according to the present embodiment may include afirst valve housing 112 having the first chamber 114, the second chamber122, and the first channel 124 a, 124 b formed therein, and a secondvalve housing 130 having the second channel 138 formed therein.

The valve housing 110 according to the present embodiment is formed witha plurality of structures of the first valve housing 112 and the secondvalve housing 130 as described above. However, it is just oneembodiment, and is also possible that the first valve housing 112 andthe second valve housing 130 are integrally formed.

The first valve housing 112 according to the present embodiment includesa housing body 113 having the first chamber 114 and the second chamber122 formed therein, and a first connector 126 a, 126 b having the firstchannel 124 a, 124 b formed therein. In addition, the first valvehousing 112 according to the present embodiment may further include afirst fastening part 127 fastened to the second valve housing 130 and asecond fastening part 128 fastened to the pump connector 150 describedbelow. The second fastening part 128 according to the present embodimentmay be formed with a fastening groove into which a separate fasteningmeans (not shown) is inserted to be coupled to the pump connector 150.

The housing body 113 according to the present embodiment has asubstantially cylindrical shape having opened top and bottom sides. Thefirst chamber 114 and the second chamber 122 are formed inside thehousing body 113. Referring to FIG. 4, the centers of the first chamber114 and the second chamber 122 according to the present embodiment maybe formed to be equal to a virtual center axis Z-Z′ passing through thecenter of the housing body 113.

The first chamber 114 and the second chamber 122 are vertically disposedinside the housing body 113. An internal partition wall 116 separatingthe first chamber 114 and the second chamber 122 is formed inside thehousing body 113. The internal partition wall 116 separates the firstchamber 114 and the second chamber 122 from each other. A chambercommunication hole 118 communicating the first chamber 114 and thesecond chamber 122 is formed in the center of the internal partitionwall 116. The housing body 113 has a shape in which the diameter isdecreased while progressing from the lower side toward the upper side.The second chamber 122 is disposed in the upper side of the housing body113 and the first chamber 114 is disposed in the lower side of thehousing body 113.

When the lower side of the first chamber 114 is opened, the firstchamber 114 is connected to the pump 36 downward. The first chamber 114defines a space through which the washing water discharged from the pump36 is introduced. The first chamber 114 is connected to the firstchannel 124 a, 124 b connected to the circulation flow path. The firstchamber 114 is connected to the second channel 138 connected to thedrainage flow path. The first chamber 114 is connected to the secondchannel 138 through the second chamber 122 in which a second disc valve180 of the disc valve 160 is disposed.

The first chamber 114 is disposed upstream of the second chamber 122.Referring to FIG. 4, the first chamber 114 is disposed below the secondchamber 122. The first chamber 114 is disposed upstream of the firstchannel 124 a, 124 b. Referring to FIG. 4, the first chamber 114 isdisposed below the first channel 124 a, 124 b.

That is, the second chamber 122 and the first channel 124 a, 124 b aredisposed downstream of the first chamber 114, and the washing water ofthe first chamber 114 may flow to the second chamber 122 or the firstchannel 124 a, 124 b due to the disc valve 160.

A channel communication hole 120 a, 120 b for communicating two spacesis formed between the first chamber 114 and the first channel 124 a, 124b.

The first chamber 114 defines a space in which the first disc valve 161of the disc valve 160 to be described below is disposed. The first discvalve 161 moves vertically based on the center axis Z-Z′ inside thefirst chamber 114, and opens and closes the channel communication hole120 a, 120 b.

The flow path diameter D1 of the first chamber 114 is formed to belarger than the flow path diameter D2 of the pump channel 152, formedinside the pump connector 150, formed by the pump connector 150.Accordingly, the washing water flowing through the pump channel 152 maybe pressurized while moving to the first chamber 114, and may flow whilespreading in an outer radial direction. The washing water flowing in thepump 36 along the pump channel 152 may flow into the first chamber 114having a large flow path diameter, while applying pressure to the lowersurface of a disc plate 162 of the first disc valve 161.

The flow path diameter D1 of the first chamber 114 according to thepresent embodiment is formed to be larger than the diameter of the firstdisc valve 161.

The second chamber 122 sends the washing water introduced from the firstchamber 114 to the second channel 138 connected to the drainage flowpath. The second chamber 122 is disposed downstream of the first chamber114. The second chamber 122 according to the present embodiment isdisposed above the first chamber 114. The second chamber 122 defines aspace in which the second disc valve 180 of the disc valve 160 isdisposed. A disc guider 132 for guiding the upward and downward movementof the disc valve 160 is disposed in the second chamber 122.

The second chamber 122 is connected to the second channel 138. The upperside of the second chamber 122 in the first valve housing 112 accordingto the present embodiment is opened. When the first valve housing 112 iscoupled with the second valve housing 130, the second chamber 122 isconnected to the second channel 138. The diameter of the flow pathformed by the second chamber 122 is formed to be smaller than thediameter of the flow path formed by the first chamber 114. The diameterof the flow path section of the second chamber 122 is formed to belarger than the diameter of the flow path section of the second channel138.

The second chamber 122 may be an area included in the second channel138. Therefore, as shown in FIG. 3, the second chamber 122 and thesecond channel 138 are not distinguished from each other, and may bedescribed with the second channel alone. Accordingly, it may beillustrated that the second disc valve 180 and the disc guider 132 aredisposed inside the second channel 138.

The first connector 126 a, 126 b is formed to protrude to be inclinedupward from the outer circumferential surface of the upper portion ofthe housing body 113. A pair of the first connectors 126 a and 126 baccording to the present embodiment formed to which are protruded fromopposite sides of the outer circumferential surface of the housing body113 are provided. Each of the pair of connectors is disposedsymmetrically with respect to the center axis Z-Z′ of the housing body113. Each of the pair of connectors is connected to each of a pair ofcirculation pipes 18 connected to the tub 31.

The first connector 126 a, 126 b is disposed in the upper side of thefirst chamber 114. Accordingly, the first channel 124 a, 124 b formedinside the first connector 126 a, 126 b is connected to the firstchamber 114 in the upper side of the first chamber 114. The firstchannel 124 a, 124 b formed inside the first connector 126 a, 126 b hasa cross-sectional area of the flow path that is reduced whileprogressing from upstream to downstream. Therefore, the flow rate of thewashing water flowing to the circulation pipe 18 may be increased.

The second valve housing 130 includes a second connector 131 forming thesecond channel 138 therein and a disc guider 132 guiding the upward anddownward movement of the disc valve 160.

The second channel 138 is disposed downstream of the second chamber 122.The second channel 138 is disposed in the upper side of the secondchamber 122. The diameter of the flow path section of the second channel138 is reduced while progressing toward the downstream. Therefore, theflow rate of the washing water flowing to the drain pipe 19 may beincreased.

The disc guider 132 is disposed in the lower side of the secondconnector 131. The disc guider 132 according to the present embodimentis disposed inside the second chamber 122 when the first valve housing112 and the second valve housing 130 are coupled.

The disc guider 132 is formed in a cylindrical shape along the centeraxis Z-Z′ of the first valve housing 112, and has a guider groove 133,to which a disc connecting bar 200 of the disc valve 160 is inserted,formed therein. The disc connecting bar 200 of the disc valve 160 isinserted into the guider groove 133 of the disc guider 132 and may moveupward and downward along the center axis Z-Z′.

The second valve housing 130 according to the present embodiment mayfurther include a guider connection part 134 which is connected to thedisc guider 132 at the lower end of the second connector 131 andsupports the disc guider 132. The guider connection part 134 may beformed in a plurality of bar shapes so that the disc guider 132 is fixedto the lower side of the second valve housing 130 without interferingwith the flow of the washing water.

In addition, the second valve housing 130 may further include afastening part 142 fastened to the first valve housing 112. The secondvalve housing 130 according to the present embodiment is disposed in theupper side of the first valve housing 112. The fastening part 142 of thesecond valve housing 130 and the first fastening part 127 of the firstvalve housing 112 may be fixed by a separate fastening member (notshown).

The second valve housing 130 according to the present embodiment isdisposed along the center axis Z-Z′ passing through the center of thehousing body 113 of the first valve housing 112.

The valve housing 110 according to the present embodiment includes apump connector 150 which is connected to the pump 36 and sends thewashing water discharged from the pump 36 to the first chamber 114. Thepump connector 150 according to the present embodiment connects the pump36 with a space inside the valve housing 110.

The pump connector 150 forms a pump channel 152 through which washingwater flows. The diameter D2 of the flow path section formed by the pumpchannel 152 is formed to be smaller than the diameter D1 of the flowpath section formed by the first chamber 114. Accordingly, when thewashing water flowing in the pump connector 150 flows into the firstchamber 114, it may be pressurized and flow while spreading in an outerradial direction. The pump connector 150 may include a fastening part158 that is fastened to the first valve housing 112.

<Disc Valve>

The disc valve 160 according to the present embodiment selectively opensand closes the chamber communication hole 118 formed between the firstchamber 114 and the second chamber 122 or the channel communication hole120 a, 120 b formed between the first chamber 114 and the first channel124 a, 124 b. The disc valve 160 according to the present embodiment maybe disposed to move upward and downward along the center axis Z-Z′ andclose the chamber communication hole 118 or the channel communicationhole 120 a, 120 b.

The disc valve 160 according to the present embodiment may block thechamber communication hole 118 or the channel communication hole 120 a,120 b according to a difference in the magnitude of the pressure causedby the weight generated in a weight part described below and thepressure of the washing water discharged from the pump 36.

The disc valve 160 according to the present embodiment may include afirst disc valve 161 which is disposed inside the first chamber 114 andopens and closes the channel communication hole 120 a, 120 b, a seconddisc valve 180 which is disposed inside the second chamber 122 and opensand closes the chamber communication hole 118, and a disc connecting bar200 which connects the first disc valve 161 and the second disc valve180.

The first disc valve 161 may move to one side according to the pressureof the washing water flowing into the first chamber 114. The first discvalve 161 according to the present embodiment may move upward accordingto the pressure of the washing water discharged from the pump 36. Thefirst disc valve 161 is disposed to be spaced by a certain distance fromthe inflow end of the first chamber 114.

The first disc valve 161 according to the present embodiment includes adisc plate 162 receiving the pressure of the washing water introducedinto the first chamber 114, a sealer 172 which is disposed in the upperside of the disc plate 162 and seals the channel communication hole 120a, 120 b, and a disc connecting portion 164 to which the disc connectingbar 200 is connected.

The disc plate 162 according to the present embodiment may have aring-like plate shape whose center is opened in the up and downdirection. The disc plate 162 according to the present embodiment mayhave a through hole 166, through which washing water flows, formed in acentral portion thereof.

Referring to FIG. 3, the diameter D3 of the through-hole 166 formedinside the disc plate 162 may be formed to be substantially equal to thediameter of the pump channel 152 formed inside the pump connector 150.Referring to FIG. 3, the outer diameter D4 of the disc plate 162 isformed to be larger than the diameter D2 of the pump channel 152 formedinside the pump connector 150 and smaller than the diameter D1 of thefirst chamber 114.

The lower surface of the disc plate 162 may be formed flat to beinfluenced by the water pressure of the washing water introduced intothe first chamber 114. The first disc valve 161 is disposed to be spacedapart by a certain distance from the inflow end of the first chamber114. Accordingly, the washing water which is introduced into the firstchamber 114 from the pump connector 150 and sprayed in an outer radialdirection may press the lower surface of the first disc valve 161.

The sealer 172 is disposed in the upper surface of the disc plate 162.The sealer 172 according to the present embodiment is disposed in theupper surface of the disc plate 162. The sealer 172 according to thepresent embodiment may be formed into a ring shape. The sealer 172according to the present embodiment blocks the channel communicationhole 120 a, 120 b when the disc valve 160 moves upward. The sealer 172according to the present embodiment has a convex shape upward.

The disc connecting part 164 according to the present embodiment isconnected to the disc connecting bar 200. The disc connecting part 164according to the present embodiment is disposed on the through hole 166formed in the center of the disc plate 162. The disc connecting part 164according to the present embodiment is disposed in the center of thedisc plate 162. The disc connecting part 164 may be connected to thedisc plate 162 and a support 168.

The disc connecting part 164 according to the present embodiment isformed with a connecting bar groove 170 into which the disc connectingbar 200 is inserted. The disc connecting bar 200 may be fixed to thedisc connecting part 164 by a separate fastening means 206. The discconnecting bar 200 may have a fastening groove 202 into which thefastening means 206 can be inserted.

The second disc valve 180 may move toward the other side opposite to theone side by the pressure caused by the load of the weight part 184, 190connected in one side. The second disc valve 180 according to thepresent embodiment may move downward according to the pressure of theload of the weight part 184, 190.

The second disc valve 180 according to the present embodiment includes avalve cork 182 for opening and closing the chamber communication hole118 formed between the first chamber 114 and the second chamber 122, anda weight housing 186 forming a space in which a first weight 188 isaccommodated in the upper side of the valve cork 182.

The valve cork 182 according to the present embodiment has a convexshape downward. The valve cork 182 according to the present embodimenthas a truncated cone shape whose area decreases downward. The weighthousing 186 is disposed in the upper side of the valve cork 182.

The weight housing 186 is extended to the upper side of the valve cork182 and defines a space in which the first weight 188 is disposed. Theweight housing 186 may have a hollow cylindrical shape. A plurality offirst weights 188 may be accommodated in the weight housing 186 inconsideration of the pressure of the washing water discharged from thepump 36.

The first weight 188 is disposed inside the weight housing 186. Thefirst weight 188 may have a flat disc shape, and a hole through whichthe disc connecting bar 200 can pass may be formed along the centerthereof. A plurality of first weights 188 may be disposed inside theweight housing 186. The number of the first weight 188 may bedifferently disposed in consideration of the pressure of the washingwater discharged from the pump 36.

The disc connecting bar 200 according to the present embodiment connectsthe first disc valve 161 and the second disc valve 180. The discconnecting bar 200 is fixed to the first disc valve 161 and the seconddisc valve 180, respectively. The disc connecting bar 200 disposes thefirst disc valve 161 and the second disc valve 180 to be spaced apart bya certain distance.

The upper end of the disc connecting bar 200 is inserted into the guidergroove 133 of the disc guider 132. The disc connecting bar 200 may moveup and down along the guider groove 133 of the disc guider 132. The discconnecting bar 200 transfers the pressure of the washing water acting onthe first disc valve 161 to the second disc valve 180. The discconnecting bar 200 transfers the pressure due to the weight of theweight part 184, 190 acting on the second disc valve 180 to the firstdisc valve 161.

<Weight Part>

The valve assembly 100 according to the present embodiment includes theweight part 184, 190 for applying pressure caused by weight to the discvalve 160. The weight part 184, 190 according to the present embodimentmay use a weight that applies pressure caused by weight to the discvalve 160 downward. However, this is just one embodiment, and may bereplaced with a member capable of applying a certain amount of pressurecaused by gravity to the disc valve 160.

The weight part 184, 190 according to the present embodiment may bedisposed to apply pressure to the disc valve 160 in the directionopposite to the direction in which the washing water flows. That is, theweight part 184, 190 may be disposed above the disc valve 160.

The washing water introduced from the pump 36 disposed below the valveassembly 100 flows from the lower side to the upper side. On the otherhand, the weight part 184, 190 may be disposed above the disc valve 160so as to apply pressure in the direction opposite to the direction inwhich the washing water flows according to weight due to gravity.Accordingly, the weight part 184, 190 may press the disc valve 160 inthe direction opposite to the flow direction of the wash water.

The weight part 184, 190 according to the present embodiment includes afirst weight part 184 which is disposed above the disc valve 160 andapplies a load to the disc valve 160, and a second weight part 184 whichis disposed above the disc valve 160 to be spaced apart and applies aload to the disc valve 160.

The first weight part 184 according to the present embodiment may bedisposed above the disc valve 160. Referring to FIG. 3, the first weightpart 184 according to the present embodiment is disposed on the upperportion of the second disc valve 180. That is, the first weight part 184may be disposed in the second chamber 122.

The first weight part 184 includes the weight housing 186 defining aspace for accommodating the first weight 188 in the upper side of thevalve cork 182 of the second disc valve 180, and the first weight 188that is accommodated inside the weight housing 186 and applies a load tothe disc valve 160.

The second weight part 190 according to the present embodiment may bedisposed in the upper side of the disc guider 132. The second weightpart 190 may be connected to the disc connecting bar 200 in the upperside of the disc connecting bar 200. The second weight part 190according to the present embodiment may be disposed inside the secondchannel 138.

The second weight part 190 includes a weight case 194 forming a spacefor accommodating the second weight 192, a weight part-connectingportion 196 connecting the weight case 194 to the disc connecting bar200, and a second weight 192 disposed inside the weight case 194 andapplying a load to the disc valve 160.

The weight case 194 according to the present embodiment may be formed ina cylindrical shape having a hollow interior, and a plurality of secondweights 192 may be disposed in the hollow interior. A plurality ofsecond weights 192 according to the present embodiment may be disposedinside the weight case 194.

The weight part-connecting portion 196 may protrude downward from thelower end of the weight case 194 and may be inserted into a connectiongroove 204 formed in the upper end of the disc connecting bar 200.

<Operation of Disc Valve>

FIG. 10A is a cross-sectional view illustrating a valve assembly when adisc valve is disposed in a first position according to an embodiment ofthe present invention. FIG. 10B is a cross-sectional view illustrating avalve assembly when a disc valve is disposed in a second positionaccording to an embodiment of the present invention. FIG. 11A is a viewfor explaining the flow of washing water in the disposition of FIG. 10A.FIG. 11B is a view for explaining the flow of washing water in thedisposition of FIG. 10B.

The pump motor disposed inside the pump 36 according to the presentembodiment may have different numbers of revolutions, in the case ofdraining the washing water in the tub 31, and in the case of circulatingthe washing water in the tub 31.

In a drainage mode in which the washing water in the tub 31 is drainedto the outside of the cabinet 10, the pump according to the presentembodiment discharges the washing water at a first set pressure. In thedrainage mode, the pump motor of the pump 36 according to the presentembodiment rotates at a first set rotational speed.

In a circulation mode in which the washing water in the tub 31 isreturned to the tub 31, the pump 36 according to the present embodimentdischarges the washing water at a second set pressure. In thecirculation mode, the pump motor of the pump 36 according to the presentembodiment rotates at a second set rotational speed.

The pump motor of the pump 36 rotates faster in the drainage mode thanin the circulation mode. Therefore, the pressure of the washing waterdischarged through the pump 36 in the drainage mode is formed to belarger than the pressure of the washing water discharged through thepump 36 in the circulation mode. That is, the first set pressure isformed to be larger than the second set pressure. The first setrotational speed is formed to be larger than the second set rotationalspeed.

The weight part 184, 190 applies a downward pressure to the disc valve160 by using a load. When the washing machine is not operated, only thepressure due to the load of the weight part 184, 190 is provided to thedisc valve 160. Therefore, when the washing machine is not operated, thedisc valve 160 is disposed in the lower side within a movable range.

When the pressure due to the load of the weight part 184, 190 is appliedto the disc valve 160, the disc valve 160 is disposed in a portion inwhich the internal partition wall 116 formed in the outer circumferenceof the chamber communication hole 118 abuts against the second discvalve 180. That is, when the washing machine is not operated, the discvalve 160 is disposed below by the weight part 184, 190 to close thechamber communication hole 118.

The pressure applied to the disc valve 160 by the load of the weightpart 184, 190 is formed to be smaller than the pressure applied to thedisc valve 160 by the washing water discharged by the pump 36 in thedrainage mode. The pressure applied to the disc valve 160 by the load ofthe weight part 184, 190 is formed to be larger than the pressureapplied to the disc valve 160 by the washing water discharged by thepump 36 in the circulation mode.

In the drainage mode of the washing machine, the pressure applied to thedisc valve 160 by the washing water discharged from the pump 36 isformed to be larger than the pressure applied to the disc valve 160 bythe weight part 184, 190, so that the disc valve 160 moves in the flowdirection of the washing water. That is, in the drainage mode of thewashing machine, the disc valve 160 moves upward.

In the drainage mode of the washing machine, the disc valve 160 isdisposed in a first position. In the first position of the disc valve160, the first disc valve 161 is disposed to block the channelcommunication hole 120 a, 120 b and the second disc valve 180 isdisposed to be spaced apart by a certain distance in the chambercommunication hole 118 to open the chamber communication hole 118.

In the circulation mode of the washing machine, the pressure applied tothe disc valve 160 by the washing water discharged from the pump 36 isformed to be smaller than the pressure applied to the disc valve 160 bythe weight part 184, 190, so that the disc valve moves in the directionin which the load of the weight part 184, 190 is applied. That is, inthe circulation mode of the washing machine, the disc valve 160 movesdownward.

In the circulation mode of the washing machine, the disc valve 160 isdisposed in a second position. In the second position of the disc valve160, the second disc valve 180 is disposed to block the chambercommunication hole 118, and the first disc valve 161 is disposed to bespaced apart by a certain distance in the channel communication hole 120a, 120 b to open the channel communication hole 120 a, 120 b.

According to the washing machine of the present invention, one or moreof the following effects can be obtained.

First, drainage and circulation can be performed simultaneously using asingle pump, which is advantageous in that material cost can be reducedcompared to using two pumps.

Second, drainage and circulation can be performed according to thepressure of the washing water discharged from the pump without using thebidirectional pump, thereby reducing the cost and preventing the reverseflow of the washing water.

Third, since the weight part that uses gravity is used as a force actingin opposition to the pressure of the washing water, the problem causedby the failure of the component is eliminated even with long use of thevalve assembly. Therefore, there is an advantage that it can be used fora long time without replacing any component.

Although the exemplary embodiments of the present invention have beendisclosed for illustrative purposes, those skilled in the art willappreciate that various modifications, additions and substitutions arepossible, without departing from the scope and spirit of the inventionas disclosed in the accompanying claims. Accordingly, the scope of thepresent invention is not construed as being limited to the describedembodiments but is defined by the appended claims as well as equivalentsthereto.

What is claimed is:
 1. A washing machine comprising: a cabinet thatdefines an outer shape of the washing machine; a tub disposed inside thecabinet and configured to receive washing water; a pump configured todischarge washing water received in the tub to an outside of the tub;and a valve assembly having a lower side configured to receive washingwater discharged from the pump, and an upper side configured todischarge washing water received through the lower side of the valveassembly, wherein the valve assembly comprises: a valve housing thatdefines an exterior of the valve assembly and that defines a valve spacetherein configured to receive washing water, a first chamber that isdefined inside the valve housing and that is configured to connect to(i) a circulation flow path configured to guide washing water to the tuband (ii) a drainage flow path configured to guide washing water to anoutside of the cabinet, a disc valve configured to linearly move insidethe first chamber along a vertical direction based on a water pressureapplied by washing water discharged from the pump toward the firstchamber, and a weight part configured to apply a load to the disc valve,wherein the disc valve is configured to, based on a difference between afirst magnitude corresponding to the water pressure and a secondmagnitude corresponding to the load, selectively discharge washing waterin the first chamber to the circulation flow path or to the drainageflow path, wherein the valve housing defines therein a first channelthat connects the first chamber to the circulation flow path, and asecond channel that connects the first chamber to the drainage flowpath, and wherein the disc valve comprises: a first disc valve disposedinside the first chamber and configured to open and close a channelcommunication hole defined between the first chamber and the firstchannel, a second disc valve disposed vertically above the first chamberand configured to open and close a chamber communication hole definedbetween the first chamber and the second channel, and a disc connectingbar that connects the first disc valve and the second disc valve to eachother.
 2. The washing machine of claim 1, wherein the disc valve isconfigured to, based on the water pressure exceeding a set pressure,connect the first chamber to the drainage flow path.
 3. The washingmachine of claim 1, wherein the disc valve is configured to, based onthe water pressure being less than or equal to a set pressure, connectthe first chamber to the circulation flow path.
 4. The washing machineof claim 1, wherein the pump is configured to, based on the valveassembly being in a circulation mode in which washing water iscirculated to the tub, discharge washing water to maintain the waterpressure to be less than or equal to the load applied to the disc valveby the weight part.
 5. The washing machine of claim 1, wherein the pumpis configured to, based on the valve assembly being in a drainage modein which washing water is discharged to the outside of the cabinet,discharge washing water to maintain the water pressure to be greaterthan the load applied to the disc valve by the weight part.
 6. Thewashing machine of claim 1, wherein the first disc valve is configuredto receive the water pressure in an upward direction from washing waterintroduced toward the first chamber, wherein the second disc valve isconfigured to receive the load in a downward direction from the weightpart, and wherein the weight part is disposed at an upper side of thesecond disc valve, and configured to apply the load to the second discvalve in the downward direction to allow the first chamber to beconnected to the circulation flow path.
 7. The washing machine of claim1, wherein the first disc valve comprises: a disc plate configured toreceive the water pressure applied by washing water introduced towardthe first chamber; and a sealer disposed at an upper side of the discplate and configured to open and close the channel communication hole.8. The washing machine of claim 1, wherein the second disc valve has aconical shape with a sectional area decreasing downward, and isconfigured to open and close the chamber communication hole.
 9. Thewashing machine of claim 1, wherein the weight part comprises: a firstweight part disposed vertically above the second disc valve andconfigured to apply a first portion of the load to the first and seconddisc valves; and a second weight part connected to an upper end of thedisc connecting bar and configured to apply a second portion of the loadto the first and second disc valves.
 10. The washing machine of claim 9,wherein the first weight part comprises: one or more first weight piecesconfigured to apply the first portion of the load to the first andsecond disc valves; and a weight housing that is disposed verticallyabove the second disc valve and that defines a space configured toaccommodate the one or more first weight pieces.
 11. The washing machineof claim 9, wherein the second weight part comprises: one or more secondweight pieces configured to apply the second portion of the load to thefirst and second disc valves; a weight case that defines a spaceconfigured to accommodate the one or more second weight pieces; and aweight connecting portion that connects the weight case to the discconnecting bar.
 12. The washing machine of claim 1, further comprising:a disc guider that defines a guider groove configured to receive atleast a portion of the disc connecting bar and to guide a verticalmovement of the first and second disc valves inside the valve housing.13. The washing machine of claim 12, wherein the disc guider is disposedvertically above the first and second disc valves.
 14. The washingmachine of claim 12, wherein the weight part comprises: a first weightpart disposed vertically below the disc guider and configured to apply afirst portion of the load to the first and second disc valves; and asecond weight part that is disposed vertically above the disc guider,that is connected to an upper end of the disc connecting bar, and thatis configured to apply a second portion of the load to the first andsecond disc valves through the disc connecting bar.
 15. The washingmachine of claim 1, wherein the disc connecting bar extends in thevertical direction and penetrates through the first and second discvalves.
 16. The washing machine of claim 1, wherein the circulation flowpath surrounds at least a portion of the drainage flow path.
 17. Thewashing machine of claim 1, wherein the drainage flow path extends inthe vertical direction, and wherein the circulation flow path extends ina direction inclined with respect to the vertical direction.
 18. Thewashing machine of claim 1, further comprising: a pump connecterdisposed at the lower side of the valve assembly and configured tosupply washing water to the first chamber based on movement of the discvalve along the vertical direction.